1999 LHS Wet floor

Pass side rear floor soppy wet. Thot it may be long weather $100.00 strip ( we had lots of rain). Replaced it, no help. Someone said AC drain tube stopped up. Got under car, removed the tube and inserted tube into drain hole and used wet/dry vacuum to such the water out and got nothing. Reversed process and blew air thru tube into the whatever it is. Nothing at all. No water came out. Seems as if water comes out and drains into pass frt and then collects intp pass rear and I have to vac out w/wet/dry vacuum. Any thoughts?

Some locally had suggested that and I discounted it because there is no antifreeze odor inside the car. Perhaps I should look at that as a possibility but I have had no issues with having to add coolant. Thank you for taking your time to comment on my problem.